Two or more sensing switches are included in a sensing unit for detecting a characteristic value of a subpixel, and are electrically coupled to a reference voltage line. The two or more sensing switches share a sampling switch with a sensing capacitor included in the sensing unit, which reduces size of the sensing unit. Sensing may include driving simultaneously two or more sensing switches sharing a sensing capacitor, or sensing may be performed through continuous and short driving after simultaneous driving. Overall sensing time can be reduced and sensing accuracy improved.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The display device of claim 1, wherein, in a first sensing period, the two or more first switches included in the group are configured to be turned on substantially simultaneously or turned off substantially simultaneously, and, in a second sensing period after the first sensing period, one first switch among the two or more first switches included in the group is configured to be turned on and others of the two or more first switches are configured to remain in a turned-off state.
4. The display device of claim 3, wherein a length of a period in which the another one first switch remains in a turned-on state in the third sensing period is shorter than a length of a period in which the two or more first switches remain in a turned-on state in the first sensing period.
5. The display device of claim 3, wherein a length of a period in which the another one first switch remains in a turned-on state in the third sensing period is shorter than a length of a period in which the one first switch remains in a turned-on state in the second sensing period.
6. The display device of claim 3, wherein, in the third sensing period, the second switch is configured to be turned on immediately after the another one first switch which has been in the turned-on state is turned off or before being in the turned-off state.
7. The display device of claim 2, wherein, in the first sensing period, the second switch is configured to be turned on immediately after the two or more first switches are simultaneously turned off or before being turned off.
8. The display device of claim 2, wherein a length of a period in which the one first switch is configured to remain in a turned-on state in the second sensing period is shorter than a length of a period in which the two or more first switches are configured to remain in a turned-on state in the first sensing period.
9. The display device of claim 2, wherein a lesser quantity of charges is driven onto the capacitor in the second sensing period than in the first sensing period.
10. The display device of claim 2, wherein, in the second sensing period, the second switch is configured to be turned on immediately after the one first switch which has been in the turned-on state is turned off or before being in the turned-off state.
15. The data driving circuit of claim 14, wherein, in at least a partial period after the two or more sensing switches included in the one sensing group are configured to be turned off and before charges charged in the sensing capacitor are discharged, one sensing switch among the two or more sensing switches is configured to be turned on and the other sensing switches are configured to remain in a turned-off state.
16. The data driving circuit of claim 15, wherein a length of a period in which the one sensing switch among the two or more sensing switches is turned on and the other sensing switches remain in the turned-off state is shorter than a length of a period in which the two or more sensing switches are simultaneously in a turned-on state.
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December 7, 2021
September 20, 2022
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